That is a really unfortunate first experience to have with a brand new TS - I hope they get it right and make you happy. I own the G1023RL (I think I may have chimed in when you were deciding) and I can't get over how wonderful this saw is. For what it's worth, my motor door doesn't swing perfectly closed - I think I've bent it a few times moving the saw around, but it is flexible and you don't need to open it more than once in a blue moon. That miter track is a deal breaker though, it needs to glide easily to be safe. Have you tried spraying some cleaning solution into the track and running some paper towel back and forth? Some Simple Green usually does the trick for me when I'm trying to de-gunk stuff, or WD40 if that fails (but you'll have to degrease after, don't leave oils on that surface).
Once it is all assembled and square/flat/true, I use acetone to degrease the surface thoroughly and then apply paste wax (wax on, wax off... etc). Buff it out and you won't see rust crop up easily, and it will glide nicely without making your pieces hard to finish!
Hang in there, once you get it all set up and turn it on that first time... it is so worth the effort :thumbsup: Now I need to get home from work so I can cut something, I miss my TS hehe.